When working on a document in hopTo, you can view the document's name in the tab in which it is open. To the left of the name you will see a small letter representing the type of the document: W for Word, X for Excel and P for PowerPoint.
If you make changes to the document, or if this document has been newly created, you will notice a small, round green icon to the left of the file name (If it's a newly created document who hasn't been named yet it will say "Untitled Document") with the shape of a small diskette in it. When this green icon is present it means that changes to the document were made and were not saved. This green icon is the save button and tapping it ensures your changes are saved. If the file was not named yet you will be prompted to name the file after tapping the save button. Once all changes are saved the green icon will be replaced with the letter representing the file type as mentioned above, until additional changes are made.